How to apply for a visa for parents to visit relatives when children are studying in Japan?

Go to the Japanese Consulate in China (where the parents are registered) or the website of the Japanese Embassy in China to find the information that parents need to visit relatives. There is a detailed explanation above. After the materials are ready, let parents take them to the consulate to apply. If it goes well, we will have the result in a week. If you are studying abroad, you'd better find a professor or associate professor from a school or research office as a guarantor for your parents to go to Japan, so that the information requirements for the guarantor will be less and the visa will be relatively easy. Good luck!